Compost Calculator
Calculate your compost C:N ratio and get adjustment recommendations for optimal decomposition.
Current C:N Ratio
50:1
Needs Adjustment
Ideal range: 25:1 – 30:1
Adjustment
Add 120.0 lbs more greens
Est. Finish Time
4–6 months
Greens
25%
Browns
75%
Common Greens (Nitrogen-Rich, ~20:1)
| Fruit/vegetable scraps | ~15:1 |
| Fresh grass clippings | ~17:1 |
| Coffee grounds | ~20:1 |
| Fresh manure | ~15:1 |
Common Browns (Carbon-Rich, ~60:1)
| Dry leaves | ~60:1 |
| Cardboard | ~350:1 |
| Straw | ~75:1 |
| Wood chips | ~400:1 |
| Newspaper | ~175:1 |
Temperature Monitoring
| Active Phase | 130–160°F (kill pathogens & weeds) |
| Curing Phase | 80–110°F (stabilizing) |
| Ready | Ambient temp, earthy smell |
| Too Hot (>170°F) | Turn pile, add water |
C:N ratios are approximations — actual values vary by material. Turn your pile every 1–2 weeks and maintain moisture like a wrung-out sponge for best results.
Use the Compost Calculator above to calculate your results. Enter your values and see instant results — all calculations run in your browser.
Disclaimer: This calculator is for informational purposes only and does not constitute tax, financial, or legal advice. Results are estimates based on the information you provide and current rates. Always consult a qualified tax professional or financial advisor for advice specific to your situation.
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